Created
September 5, 2014 08:40
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Writing succinct constraints
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import Cocoa | |
struct Constraint { | |
typealias T = (attribute: CAConstraintAttribute, relativeTo:String, relatedAttribute: CAConstraintAttribute, offset: CGFloat) | |
let data: T | |
func create() -> CAConstraint { | |
let newConstraint: AnyObject! = CAConstraint.constraintWithAttribute(data.attribute, relativeTo: data.relativeTo, attribute: data.relatedAttribute, offset: data.offset) | |
return newConstraint as CAConstraint | |
} | |
static func process(list:[T], _ layer:CALayer) { | |
for each in list { | |
let c = Constraint(data:each).create() | |
layer.addConstraint(c) | |
} | |
} | |
} | |
var r = CGRectMake(0,0,300,300) | |
var view = NSView(frame:r) | |
var layer = CALayer() | |
layer.layoutManager = CAConstraintLayoutManager() | |
//MARK:- You can now create a layer and define constraints in a succinct manner | |
var layerB = CALayer() | |
layerB.name = "layerB" | |
layerB.bounds = CGRectMake(0,0,300,60) | |
layerB.borderWidth = 2.0 | |
layerB.backgroundColor = NSColor.redColor().CGColor | |
//MARK:- here's the core idea, use the typed tuple as a container and massage it into a layer | |
var layerB_Constraints:[Constraint.T] = [ | |
(.Width, "layerA", .Width, 0), | |
(.MidX, "layerA", .MidX, 0), | |
(.MaxY, "layerA", .MinY, -10), | |
(.MinY, "superlayer", .MinY, +10)] | |
Constraint.process(layerB_Constraints,layerB) | |
//MARK:- etc… | |
var layerA = CALayer() | |
layerA.name = "layerA" | |
layerA.bounds = CGRectMake(0,0,200,125) | |
layerA.borderWidth = 2.0 | |
layerA.backgroundColor = NSColor.greenColor().CGColor | |
Constraint.process([(.MidY, "superlayer", .MidY, 0), ( .MidX, "superlayer", .MidX, 0)], layerA) | |
layer.addSublayer(layerA) | |
layer.addSublayer(layerB) | |
view.layer = layer |
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